Operculum Shell and Sterling Silver. Throughout human history, the Shiva Shell or Operculum has had significant meanings in cultures around the work. In Southeast Asia, it is known as "Shiva's Eye" and it is believed to have protective properties benefiting the wearer. The operculum is not a part of the mollusk in the shell or even the shell itself; it is actually produce by a separate organ located on the animal's foot. The opercula of some species are secreted spirally, with new material being deposited on the edge only, and the operculum slowly rotating on the disc as it grows. They are found discarded on the beaches.